Color:Black&Purple marble Quantity:2 in one pack Type:Phone card holder with flap/lid Size:3.7*2.3 inches Thickness: 0.08 mm Material: Spandex Lycra material Function: To insert credit cards/ID cards or cash/gum/key/earphone Q&A 1.If cards will fall out easily? A:No.it mades from stretchy material that keeps cards from falling out.And the flap will prevent cards from falling.Elasticity is better than faux leather and silicone. 2.How many cards this card wallet can hold? A:The FULGAMO card wallet can hold at least 7 cards.Also it can hold other small stuff,like earphone,keys etc. 3.Will this stick to phone case? A: Yes it will stick to any smooth face case. PS:For phone back with anti fingerprint glass back,please stick the card holder on phone case. Glass back will not stick.